The focus-length of the actor of an astronomical instrument is 20 mm.

1.	The focus-length of the actor of an astronomical instrument is 20 mm. When the final reflection is formed infinitely during normal adjustment The difference between the two lenses is 500 mm. In this case the magnification of the instrument
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The focus-length of the actor of an astronomical instrument is 20 mm. When the final reflection is formed infinitely during normal adjustment The difference between the two lenses is 500 mm. In this case the magnification of the instrument

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MARK ME AS BRAINLIEST THEN I WILL ANSWER

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The focus-length of the actor of an astronomical instrument is 20 mm. When the final reflection is formed infinitely during normal adjustment The difference between the two lenses is 500 mm. In this case the magnification of the instrument

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